Kg is the torque that the servo has ie how much force the servo puts into the steering. sec rating is time for servo to turn so lower number quicker the servo and faster steering.
what you should look for is any thing with metal gears so that the servo will last longer and take the front end hits. I suggest look at your current servo and look to improve upon it ie buy one thats metal geared and quicker.
You could get a nice savox servo for around 50. A savox is good one to go with, a brand which many people use and trust.
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